Developer Tools
Fast, private developer utilities — JSON, encoding, hashing, color, CSS, generators, formatters and reference cheatsheets. Everything runs client-side in your browser, so your code and data never leave your device.
A fast, private toolbox for developers: format and validate JSON, YAML and XML; encode and decode Base64, URLs and JWTs; generate hashes, UUIDs, passwords and mock data; convert colours; build CSS; and reach for a reference cheatsheet when you need one. No tab-switching across a dozen different sites — they are all here, and all instant.
Because every tool runs client-side, your code, tokens and payloads never leave the browser. That makes it safe to paste a production JSON blob, a JWT or an API response without it being uploaded to a third-party server. No sign-in, no rate limits, and no telemetry on the data you process.
JSON & Data
JSON Formatter & Validator
Pretty-print, minify and validate JSON instantly.
SQL Playground
Run real SQL against an in-browser SQLite database — no install, no server.
CSV Explorer & Cleaner
Paste or upload a CSV, then sort, filter, de-duplicate and export it.
Avro Schema Viewer
Parse and visualize Apache Avro schema JSON files as a collapsible tree.
CBOR to JSON Converter
Decode CBOR (RFC 8949) binary data to readable JSON, fully in your browser.
Config File Diff (ENV / TOML / INI)
Diff two .env, .toml, or .ini config files and see key-level changes
CSV Cleaner
Trim whitespace, fix encodings, and normalize line endings in CSV files
CSV Column Statistics
Get min, max, mean, median, std-dev, and null-count per CSV column
CSV Date Format Normalizer
Detect and normalize inconsistent date columns in CSV to ISO 8601.
CSV Deduplicator
Remove duplicate rows from a CSV by one or more key columns
CSV Diff
Compare two CSV files row-by-row and highlight added, removed, changed rows
CSV Offline Geocoder (City / Country Level)
Add lat/lon to a CSV city column using an embedded gazetteer — no API.
CSV Joiner
Join / merge two CSV files on a shared key column (SQL-style LEFT JOIN)
CSV Outlier Detector
Flag statistical outliers in numeric CSV columns using IQR or Z-score.
CSV Pivot Table Builder
Build pivot tables from a CSV — rows, columns, values, aggregation
CSV Splitter
Split a large CSV into smaller chunks by row count or column value
CSV to GeoJSON Converter
Build GeoJSON from a CSV with lat/lon columns — instant map-ready output
CSV to GraphQL Mutation Generator
Turn a CSV into ready-to-run GraphQL createX mutation calls, one per row.
CSV to KML Converter
Build Google Earth KML from a CSV with lat/lon columns
CSV to NDJSON Converter
Convert CSV to Newline-Delimited JSON for log pipelines and BigQuery
CSV to XLSX Converter
Convert a CSV file into an Excel .xlsx workbook right in your browser
CSV to XML Converter
Convert CSV rows to XML elements with configurable root and row tag names
CSV to YAML Converter
Convert CSV data to a YAML list of mappings for config files and pipelines
CSV Column Type Inferrer
Detect the probable data type of each CSV column — date, int, float, bool
DNS-over-HTTPS Privacy Query Tester
Resolve a domain via Cloudflare or Google DoH and compare the answers side by side
GeoJSON Minifier
Strip whitespace and round coordinate precision to shrink GeoJSON files
GeoJSON Geometry Simplifier
Simplify complex GeoJSON geometries with Visvalingam-Whyatt to reduce size
GeoJSON to CSV Converter
Flatten GeoJSON properties + coordinates to a downloadable CSV
GeoJSON to GPX Converter
Convert GeoJSON Features and FeatureCollections to valid GPX 1.1
GeoJSON to TopoJSON Converter
Convert GeoJSON to TopoJSON to shrink file size via shared arcs
GeoJSON Validator
Validate GeoJSON against RFC 7946 and show geometry errors inline
GPX to CSV Converter
Export GPX track points to CSV with lat, lon, ele and time columns
GPX to GeoJSON Converter
Turn GPS tracks into GeoJSON for web maps and data pipelines
GraphQL Schema Visualizer
Paste a GraphQL SDL schema and see type relationships as a graph.
ICC Profile to JSON Converter
Decode an ICC/ICM color profile binary to human-readable JSON
JSON Diff
Compare two JSON objects and see added, removed, and changed fields
JSON Lines / NDJSON Viewer
Browse and filter NDJSON files line-by-line with a searchable table
JSON Schema Validator
Validate JSON documents against a JSON Schema (draft-07 / 2020-12)
JSON to CBOR Converter
Encode JSON to compact CBOR binary and see the hex dump and byte savings.
JSON to GraphQL Schema Generator
Generate a GraphQL SDL schema from a sample JSON object
JSON to HTML Table
Convert a JSON array of objects into a clean HTML table — copy or preview.
JSONPath Tester
Test JSONPath expressions against a JSON document and see matching nodes
KML to CSV Converter
Extract KML Placemark coordinates and names to a flat CSV
NDJSON Validator
Validate every line of an NDJSON file and report parse errors by line number
Parquet Schema Viewer
Inspect the schema and metadata of a Parquet file without a backend
Plist to JSON Converter
Convert macOS XML or binary plist to JSON in your browser
Prisma Schema Viewer
Parse a Prisma schema.prisma and view models, fields, types and relations.
Protobuf Decoder (No Schema)
Decode raw Protobuf wire bytes without a .proto file, right in your browser.
Shapefile to GeoJSON Converter
Convert ESRI Shapefiles to GeoJSON entirely in the browser
XML Sitemap Validator
Validate a sitemap.xml for schema compliance and detect malformed entries
SQL CREATE TABLE to JSON Schema
Convert SQL CREATE TABLE DDL into a JSON Schema draft-07 or TypeScript interface.
SQLite Schema Viewer
Inspect SQLite table schemas, indexes and foreign keys without a GUI
SQLite to CSV Exporter
Export any SQLite table to CSV directly in your browser
SQLite Database Viewer
Open and browse SQLite .db files in your browser — no upload
TopoJSON to GeoJSON Converter
Decode TopoJSON back to GeoJSON for tools that don't support TopoJSON
XLSX to CSV Converter
Convert Excel spreadsheet sheets to CSV files — no Excel required
YAML Linter
Lint YAML for syntax errors, duplicate keys, and common gotchas
CSV Field Escaper/Unescaper
Wrap and escape fields with commas, quotes, or newlines in CSV
Fake GeoJSON Generator
Random GeoJSON features for mapping tool demos
JSON String Escaper/Unescaper
Escape control chars and backslashes for valid JSON strings
Mock CSV Generator
Downloadable CSV test data in seconds
Mock SQL Rows Generator
Ready-to-run INSERT statements with realistic fake data for any table
Mock TOML Generator
Fake TOML config files for Rust and other tools
Mock XML Generator
Structured XML test data for legacy systems
Mock YAML Generator
Fake YAML config files for testing and demos
JSON-LD Schema Markup Generator
Structured data snippets for SEO and AI discovery
Random JSON Schema Generator
Valid JSON Schema documents for API tooling tests
SQL String Escaper
Escape single quotes and backslashes for safe SQL literals
Protobuf Varint Encoder/Decoder
Encode integers as Protocol Buffers variable-length integers
XML Entity Escaper/Unescaper
Escape the 5 XML special chars amp, lt, gt, apos, and quot
JSON to CSV Converter
Flatten a JSON array of objects into clean CSV.
CSV to JSON Converter
Turn CSV into a clean JSON array of objects.
JSON to YAML Converter
Convert JSON into clean, readable YAML.
YAML to JSON Converter
Convert YAML config into formatted JSON.
XML Formatter & Minifier
Pretty-print or minify XML right in your browser — nothing is uploaded.
YAML Formatter & Re-indenter
Normalise YAML indentation and spacing in your browser — no upload.
SQL Formatter & Beautifier
Pretty-print SQL queries in your browser — keywords on their own lines.
JSON to XML Converter
Convert JSON objects and arrays into well-formed XML.
XML to JSON Converter
Convert XML documents into clean, structured JSON.
JSON to TOML Converter
Convert JSON into clean TOML config syntax.
TOML to JSON Converter
Convert TOML config files into structured JSON.
JSON to TypeScript Interface
Generate TypeScript interfaces from a JSON sample.
JSON Escape / Unescape
Encode text into a JSON string or decode it back.
CSV to TSV Converter
Convert comma-separated values to tab-separated values.
TSV to CSV Converter
Convert tab-separated values to proper RFC 4180 CSV.
JSON to SQL INSERT Generator
Turn a JSON array of objects into SQL INSERT statements.
CSV to SQL INSERT Generator
Turn a CSV file into SQL INSERT statements.
JSON String Escape / Unescape
Escape text into a JSON string literal, or unescape it back.
JSON Minifier
Compact JSON to a single line and validate it.
JSON Diff Tool
Compare two JSON documents and see what changed.
JSON to Go Struct
Generate Go structs with json tags from a JSON sample.
JSON to Zod Schema
Generate a Zod validation schema from a JSON sample.
SQL Cheatsheet
The everyday SQL statements, grouped and searchable — copy any one.
JSONPath Tester
Test JSONPath expressions against your JSON, live in the browser.
Mock JSON Generator
Generate realistic mock JSON records for users, products and posts.
JSONPath Query Playground
Paste JSON, run JSONPath expressions, see matched values and their paths live.
Excel (XLSX) to CSV & JSON Converter
Upload a spreadsheet, pick a sheet, preview it, and export clean CSV or JSON.
JSON to .env Converter
Turn a JSON config object into dotenv key=value lines — in your browser.
.env to JSON Converter
Parse a dotenv file into a clean JSON object — privately in your browser.
JSON Flattener
Flatten nested JSON into single-level dot-path keys — in your browser.
JSON Unflattener
Rebuild nested JSON from flat dot-path keys — privately in your browser.
JSON Key Sorter
Sort JSON object keys alphabetically and recursively — in your browser.
SQL IN Clause Builder
Turn a list of values into a ready-to-paste SQL IN (...) clause.
CSV to HTML Table
Convert CSV into a clean, escaped HTML <table> you can paste anywhere.
HTML Table to CSV
Extract any HTML <table> into clean, properly quoted CSV.
JSON Schema Generator
Paste JSON and infer a ready-to-use JSON Schema you can copy or download.
CSV Merger
Combine two or more CSV files by stacking rows or joining on a key column.
YAML / JSON / TOML Converter
Paste any of the three formats and convert instantly between them.
CSV Statistics Analyzer
Upload a CSV and get instant per-column stats, distributions and histograms.
JSON Flatten / Unflatten
Convert nested JSON to dot-notation keys and back, losslessly.
SQL and GraphQL Formatter
Paste a messy SQL or GraphQL query and pretty-print it with clean indentation.
JSON Pretty-Diff
Compare two JSON documents and see exactly what was added, removed or changed.
JSON to Protobuf Schema Generator
Paste sample JSON and infer a ready-to-use Protocol Buffers .proto file.
JSON to TypeScript Interfaces
Paste JSON, get clean nested TypeScript interfaces or type aliases.
SQL Minifier
Collapse formatted SQL into the smallest valid one-line statement.
CSV to JSON Converter (and JSON to CSV)
Convert CSV to a JSON array or JSON back to CSV — with delimiter and header controls.
CSV Diff Tool
Compare two CSV files by a key column and see added, removed and changed rows.
TOML ⇄ JSON Converter
Convert between TOML and JSON in either direction, with validation.
YAML to JSON Converter (Both Directions)
Paste YAML or JSON, convert either way with validation and clear error messages.
Nested JSON Flattener
Flatten nested JSON to dot-notation keys, unflatten back, and export flat CSV.
Query String Parser & Builder
Parse a URL query into an editable table, then rebuild and copy it.
Product Schema Generator
Generate valid schema.org Product JSON-LD for rich Google results.
Breadcrumb Schema Generator
Generate valid schema.org BreadcrumbList JSON-LD in seconds.
FAQ Schema Generator
Build valid FAQPage JSON-LD structured data in seconds.
Schema Markup Generator
Generate valid JSON-LD structured data for any schema.org type instantly.
Video Schema Generator
Generate valid schema.org VideoObject JSON-LD for better video SEO.
Article Schema Generator
Build valid JSON-LD structured data for any article type in seconds.
Local Business Schema Generator
Generate valid schema.org/LocalBusiness JSON-LD for Google Rich Results — free and instant.
Encoding & Crypto
JWT Decoder
Decode any JSON Web Token instantly — header, payload, and timestamps.
Base64 Encoder/Decoder with Binary Safety
Encode or decode Base64 and Base64url strings with binary-safe handling
UUID Generator & Version Validator
Generate cryptographically random UUIDs v4/v7 and validate the version of any UUID
Base64 File Encoder / Decoder
Encode any file to base64 or decode base64 back to a file — fully local.
Bcrypt Hash Generator & Verifier
Hash or verify a password with bcrypt at any cost factor, fully in-browser
HTML Entity & Unicode Escape Decoder
Decode HTML entities, \uXXXX escapes, and percent-encoding in a single pass
JWT Decoder & Structure Verifier
Decode a JWT and inspect its header, payload, and expiry locally
Shapefile Viewer (SHP + DBF)
View ESRI Shapefile geometries and attribute table in your browser
Subresource Integrity (SRI) Hash Generator
Paste or drop a JS/CSS file and get the sha384 SRI hash for your script or link tag
Text Hash Generator
Hash any text with MD5, SHA-1, SHA-256, SHA-384, or SHA-512 — locally.
Bulk UUID / ULID Generator
Generate thousands of UUID v4 or ULID values and download as CSV or TXT.
Backslash Escaper & Unescaper
Escape special characters with C-style backslash sequences
Base32 Crockford Encoder/Decoder
Douglas Crockford's human-friendly Base32 without I, L, O, U
Base32 Encoder and Decoder
Encode text to RFC 4648 Base32 and decode it back, with optional padding
Base32 Geohash Alphabet Encoder
Encode data using the geohash Base32 character set
Base32Hex Encoder and Decoder
Extended hex Base32 variant used in DNSSEC NSEC3 and sortable IDs
Base58 Bitcoin Encoder/Decoder
Bitcoin-style Base58 encoding — no 0, O, I, l confusion
Base58 Flickr Encoder/Decoder
Flickr's Base58 variant for short photo URL IDs
Base58 Ripple Encoder/Decoder
XRP Ledger Base58Check address encoding and decoding
Base64 MIME Encoder (Line-Wrapped)
Standard MIME Base64 with 76-char line breaks per RFC 2045
PEM Base64 Encoder (64-char Lines)
OpenSSL-style Base64 wrapped at 64 chars with header/footer
Base85 / Ascii85 Encoder/Decoder
PDF and PostScript-style 5-char-per-4-bytes encoding
C String Literal Escaper & Unescaper
Convert text to valid C/C++ string literal content and back
CRC-16/Modbus Checksum Calculator
Compute CRC-16 using the Modbus polynomial variant
CRC-16 Checksum Calculator
Compute the 16-bit CRC-16/CCITT checksum
CRC-32 Checksum Calculator
Compute the standard 32-bit CRC-32 checksum
CRC-32C (Castagnoli) Checksum
Compute CRC-32C for iSCSI, SCTP, and NVMe integrity checks
CRC-64 Checksum Calculator
Compute a 64-bit CRC for large data integrity checks
CRC-8 Checksum Calculator
Compute the 8-bit CRC checksum of any text or hex bytes
CRC32 Checksum Calculator
Compute the CRC-32 checksum of text encoded as UTF-8 bytes
Decimal Integer to Base64
Encode a decimal integer directly as a Base64 string
JWT-Format Token Generator
Base64url-encoded JWT-format tokens for testing
Geohash to Lat/Lng Converter
Decode a geohash string back to lat/long bounding box and center
Git Object Hash Calculator
Calculate the SHA-1 git blob/tree/commit hash for text
BLAKE2b Hash Generator
Compute a BLAKE2b digest (up to 512 bits)
BLAKE2s Hash Generator
Compute a BLAKE2s digest (up to 256 bits)
BLAKE3 Hash Generator
Compute the ultra-fast BLAKE3 cryptographic digest in your browser
djb2 Hash Calculator
Compute the classic djb2 string hash function
FNV-1a Hash Calculator
Compute the fast non-cryptographic FNV-1a hash
Hash Identifier
Identify which algorithm produced a given hash string
Keccak-256 Hash Generator
Compute the Ethereum-style Keccak-256 digest
MD5 Hash Generator
Compute the 128-bit MD5 digest of any text
MurmurHash3 Calculator
Compute the MurmurHash3 32-bit hash for hash tables
RIPEMD-160 Hash Generator
Compute the 160-bit RIPEMD-160 digest used in Bitcoin
SHA-1 Hash Generator
Compute the 160-bit SHA-1 digest of any text
SHA-224 Hash Generator
Compute the 224-bit SHA-2 digest of any text
SHA-256 Hash Generator
Compute the 256-bit SHA-256 digest of any text
SHA-3 (256-bit) Hash Generator
Compute a 256-bit Keccak-based SHA-3 digest
SHA-3 (512-bit) Hash Generator
Compute a 512-bit Keccak-based SHA-3 digest
SHA-384 Hash Generator
Compute the 384-bit SHA-2 digest of any text
SHA-512/256 Hash Generator
Compute the SHA-512/256 truncated digest of any text
SHA-512 Hash Generator
Compute the 512-bit SHA-2 digest of any text
Whirlpool Hash Generator
Compute the 512-bit Whirlpool cryptographic digest
xxHash Calculator
Compute the extremely fast xxHash32/64 non-cryptographic hash
HMAC-SHA256 Generator
Compute keyed HMAC-SHA256 message authentication codes
HTML Entity Decoder
Decode HTML named, decimal, and hex entities back to plain text
HTML Named Entity Encoder/Decoder
Convert special characters to named entities like &amp; and &lt;
HTML Numeric Entity Encoder/Decoder
Convert characters to &#160; decimal or &#x00A0; hex entities
JWT Decoder (Header + Payload)
Decode JWT header and payload Base64url segments visually
JWT HS256 Encoder (Client-Side)
Build and HMAC-sign a JWT token in your browser
Lat/Lng to Geohash Converter
Encode geographic coordinates as a geohash string
Base58Check Encoder (with Checksum)
Base58 + 4-byte SHA256d checksum — Bitcoin address format
Punycode Encoder/Decoder
Convert international domain names to and from Punycode (ACE)
Punycode / IDN Encoder/Decoder
Convert Unicode domain names to ASCII-compatible xn-- form
Quoted-Printable Encoder/Decoder
MIME-safe encoding that keeps ASCII readable in email bodies
Shell Argument Escaper
Quote and escape strings for safe Bash/sh command arguments
Unicode \u Escape Encoder & Decoder
Encode any string as \uXXXX or \UXXXXXXXX escape sequences
URL-Safe Base64 Encoder/Decoder
Base64 with + to - and / to _ for URL and filename safety
UUID Generator
RFC-compliant version-4 UUIDs in bulk or one at a time
UUID Version Identifier
Parse a UUID string and identify its version and variant
Base64 Encoder
Encode text to Base64 — standard or URL-safe — in your browser.
Base64 Decoder
Decode Base64 back to text — standard and URL-safe — in your browser.
URL Encoder
Percent-encode text and URLs — component or full-URL mode.
HTML Entity Encoder & Decoder
Escape and unescape HTML entities — safely, in your browser.
SHA-1 Hash Generator
Generate a SHA-1 hash from any text instantly — in your browser.
SHA-256 Hash Generator
Generate a SHA-256 hash from any text instantly — in your browser.
SHA-512 Hash Generator
Generate a SHA-512 hash from any text instantly — in your browser.
MD5 Hash Generator
Generate an MD5 hash from any text instantly — in your browser.
CRC-32 Checksum Generator
Compute a CRC-32 checksum from any text — hex and decimal, in your browser.
UUID v4 Generator
Generate random RFC 4122 UUID v4 identifiers in bulk.
UUID v1 Generator
Generate time-based RFC 4122 UUID v1 identifiers.
UUID v7 Generator
Generate sortable, timestamp-prefixed UUID v7 identifiers.
ULID Generator
Generate sortable, URL-safe ULID identifiers.
Nano ID Generator
Generate compact, URL-safe Nano IDs with custom length and alphabet.
JWT Claims Explainer
Decode a JWT and see what every standard claim actually means.
Color Shades & Tints Generator
Generate tints, shades and a full tonal scale from any base colour.
JWT Generator (HS256)
Sign HS256 JSON Web Tokens in your browser with Web Crypto.
CSS Color Shades & Tints Generator
Build shades and tints of any colour and copy them as CSS variables.
Tailwind Shade Generator
Turn one colour into a full Tailwind 50–950 palette config.
Color From Text Hash
Turn any string into a consistent, repeatable color.
HMAC Generator
Keyed-hash message authentication codes — SHA-256, SHA-384, SHA-512.
Base32 Encoder & Decoder
Encode and decode RFC 4648 Base32 — case-insensitive, A–Z and 2–7.
Base58 Encoder & Decoder
Encode and decode Base58 using the Bitcoin alphabet.
SHA3-256 Hash Generator
Generate FIPS 202 SHA3-256 (Keccak) hashes in your browser.
RIPEMD-160 Hash Generator
Generate 160-bit RIPEMD-160 hashes in your browser.
CSS Box Shadow Generator
Build a box-shadow with live preview and copy the CSS.
CSS Text Shadow Generator
Style a text-shadow with live preview and copy the CSS.
Base64 URL-Safe Encoder
Encode and decode Base64URL (RFC 4648 §5) for tokens and URLs.
Quoted-Printable Encoder
Encode and decode Quoted-Printable (RFC 2045) email content.
Punycode Converter
Convert between Unicode domains and Punycode (xn--) per RFC 3492.
Base85 Encoder
Encode and decode Base85 (Z85) — compact 4-byte to 5-char binary text.
ASCII85 Encoder
Encode and decode Adobe ASCII85 used in PostScript and PDF.
File Hash & Checksum Tool
Compute MD5, SHA-1, SHA-256 and SHA-512 for any file — and verify it.
JWT Builder
Build and sign a JSON Web Token (HS256) entirely in your browser.
Multiple Box Shadow Generator
Stack, reorder and tune layered CSS box-shadows with a live preview.
Hash Generator (SHA-1 / SHA-256 / SHA-384 / SHA-512)
Hash text or files with multiple SHA algorithms at once and verify checksums.
CSS Text-Shadow Generator
Build layered text shadows visually and copy the CSS.
Base64 File Encoder & Decoder
Encode any file to Base64 or a data URL, and decode Base64 back to a downloadable file.
UUID / ULID Batch Generator
Generate hundreds of v4 UUIDs or ULIDs at once, then copy or download.
Text Encryptor (AES-256)
Password-encrypt any text with AES-256-GCM, entirely in your browser.
HTML Entity Encoder / Decoder
Convert text to and from HTML entities — named and numeric.
Base32 Encoder / Decoder
Encode and decode text to RFC 4648 base32, right in your browser.
URL Encoder / Decoder
Percent-encode or decode URLs and query values — component or full-URL mode, batch lines, copy.
String Escape Tool
Escape or unescape a string for JSON, JavaScript, CSV, SQL, regex and shell.
Base58 Encoder / Decoder
Bitcoin-style Base58 and Base58Check encode and decode, right in your browser.
Color
Color Converter + WCAG Contrast Checker
Convert hex, RGB, and HSL colours instantly — and check WCAG contrast ratios.
CSS Color & Variable Extractor
Extract all custom properties and color values from a CSS file
Hex Dump Viewer
View any file as a classic offset-hex-ASCII dump, entirely in your browser.
KML Color / Style Editor
Edit KML Placemark colors, line widths, and icon scale in your browser
Secure Random Bytes / Hex Generator
Generate cryptographically random bytes in hex, base64, or decimal — fully offline
ANSI Color Code Converter
Convert any hex color to the nearest ANSI 256-color terminal code and escape sequence.
Base16 (Hex) Encoder/Decoder
Encode raw bytes as RFC 4648 uppercase hex pairs
Binary to Hex Converter
Translate base-2 binary strings directly into hexadecimal
Color Invert (Complementary) Tool
Find the exact color inverse by subtracting from white
Color Mix Calculator
Calculate the resulting RGB color when mixing two colors
Color Opacity / Alpha Mixer
Preview a semi-transparent color over a white or black background
Color Temperature to RGB Converter
Convert blackbody color temperature in Kelvin to RGB
Color to CSS filter() Converter
Generate a CSS filter string to recolor a black SVG/PNG to any color
Windows-1252 Hex Dump
Show each character's Windows-1252 (CP1252) code point in hex
CSS Gradient Color Extractor
Extract all color stops from a CSS linear or radial gradient
CSS hsl() / oklch() String Builder
Build valid CSS hsl() or oklch() color function strings
Hex Color Code Text Encoder
Encode text bytes as CSS hex color codes
CSS Hex Shorthand Expander
Expand 3-digit CSS hex shorthand (#F80) to full 6-digit form
Hex Text Converter
Convert text to hex bytes and hex back to text
Hex to Binary Converter
Expand hexadecimal values into full binary bit strings
Hex to Nearest CSS Named Color
Find the closest CSS named color to any hex value
3-Digit to 6-Digit Hex Color Expander
Expand shorthand CSS
Hex8 (RGBA Hex) Alpha Converter
Convert 8-digit hex colors (#RRGGBBAA) including alpha channel
Hexspeak Word Encoder
Write messages using hex-readable words: DEADBEEF, CAFEBABE
HSL to Hex Converter
Convert HSL color values to a CSS hex code
CIE L*a*b* to RGB Color Converter
Convert CIELAB perceptual colors back to sRGB
Leet Hex Encoder
Encode text to leetspeak then show hex byte values
Material Design Color Lookup
Find the closest Material Design 3 color token to any hex value
CSS Named Color to Hex Converter
Look up any CSS named color and get its hex code
Octal to Hex Converter
Convert base-8 octal values to hexadecimal
Oklch to RGB Converter
Convert Oklch lightness/chroma/hue back to sRGB
Pantone to RGB Approximator
Look up approximate RGB values for common Pantone spot colors
RAL Color to Hex Converter
Convert RAL paint/coatings codes to approximate hex colors
Binary/Hex Encoder
Convert text to binary, hex, and base64
Tailwind CSS Gradient Class Generator
Tailwind gradient utility class combinations
RGB to CMYK Color Converter
Convert screen RGB colors to the CMYK print model
RGB to Grayscale Converter
Convert any color to greyscale using luminance weighting
Batch RGB to HSL Converter
Convert a list of RGB values to HSL all at once
RGB to CIE L*a*b* Color Converter
Convert RGB to the perceptually uniform CIELAB color space
RGB to LCH Color Converter
Convert RGB to CIELCh (lightness, chroma, hue) cylindrical space
RGB to Oklab Color Converter
Convert RGB to the Oklab perceptually uniform color space
RGB to Oklch Color Converter
Convert RGB to the perceptually uniform Oklch color space
sRGB to Display P3 Converter
Convert sRGB colors to wide-gamut Display P3 color space
RGB to Tailwind Color Matcher
Find the closest Tailwind CSS palette color to any RGB value
RGB to CIE XYZ Color Converter
Convert sRGB colors to the CIE XYZ tristimulus color space
Hex to CSS rgba() String Converter
Turn a hex color plus opacity into a ready-to-paste CSS rgba() function string.
Tailwind Color Config Generator
Custom Tailwind CSS color scale configurations
Tailwind Color Name to Hex
Look up the hex code of any Tailwind CSS color by name
UTF-16 Hex Viewer
Show UTF-16 LE and BE byte sequences for any Unicode text
UTF-32 Hex Viewer
Show each Unicode code point as a 4-byte UTF-32 hex value
CIE XYZ to RGB Color Converter
Convert CIE XYZ tristimulus values back to sRGB
Hex to Text Converter
Convert hex bytes to text and text to hex — UTF-8, in your browser.
WCAG Color Contrast Checker
Check text and background colors against WCAG AA and AAA contrast ratios.
Decimal to Hex Converter
Convert any whole number to hexadecimal, with optional 0x prefix.
Hex to Decimal Converter
Turn any hexadecimal value into its base-10 number.
Hex to RGB Converter
Turn any hex colour code into an RGB value instantly.
RGB to Hex Converter
Convert RGB channel values into a hex colour code.
RGB to HSL Converter
Convert RGB colour values into hue, saturation and lightness.
HSL to RGB Converter
Convert hue, saturation and lightness into RGB values.
Hex to CMYK Converter
Convert a hex colour code into CMYK for print work.
Color Name to Hex Converter
Look up the hex code for any CSS named colour.
CSS Gradient Generator
Build linear and radial CSS gradients with a live preview and copy-ready code.
Complementary Color Finder
Find complementary, analogous, triadic and tetradic colour harmonies.
Color Blindness Simulator
See how a colour looks with protanopia, deuteranopia and tritanopia.
Random Color Palette Generator
Generate harmonious 5-colour palettes with copy-ready hex and CSS.
RGB to HSV Converter
Convert RGB colour values into hue, saturation and value.
CMYK to RGB Converter
Convert print CMYK percentages into screen RGB values.
Hex to HSL Converter
Convert a hex colour code into hue, saturation and lightness.
RGBA to Hex Converter
Convert RGBA colour with alpha into an 8-digit hex code.
HSV to RGB Converter
Convert hue, saturation and value into RGB colour values.
Contrast Grid Checker
WCAG contrast ratios for every colour pair in your palette, at a glance.
Monochrome Palette Generator
Build a cohesive single-hue palette from one base colour.
Analogous Color Finder
Find harmonious neighbour colours on the colour wheel.
Color Temperature Converter (Kelvin to RGB)
Turn a Kelvin colour temperature into an approximate sRGB colour.
Pantone to Hex (Approximate)
Look up an approximate screen hex for a Pantone PMS coated colour.
Hex to Pantone (Approximate)
Find the closest Pantone PMS coated colours to any hex value.
Color Mixer (Blend Two Colors)
Blend two colours at any ratio — gamma-correct or simple sRGB.
Triadic Color Scheme Generator
Build a balanced triadic palette — three hues 120° apart.
CSS Gradient Generator (Pro)
Build multi-stop linear, radial and conic CSS gradients visually, then copy the code.
CSS Text Gradient Generator
Create gradient-filled text and copy the CSS.
CSS Color Names List
All CSS named colors with hex and RGB — searchable.
CSS Conic Gradient Generator
Build colour wheels, pie charts and angular sweeps with a draggable conic editor.
Color Contrast Checker
Check WCAG contrast ratio for two colors with live AA/AAA pass-fail.
Color Format Converter
Convert a colour between HEX, RGB, HSL and HWB live — with a picker and alpha.
Color Scale Builder
Generate an even, multi-stop colour ramp with CSS, JSON and SVG export.
CSS Color Names
Searchable list of every named CSS colour with swatch, hex, rgb and hsl.
WCAG Contrast Checker
Instant AA/AAA contrast ratio check with sRGB-accurate maths and fix suggestions.
Hex to RGBA Converter
Instantly convert any hex colour to rgba(), rgb(), HSL, CSS variables and Tailwind classes.
Color Contrast Ratio Checker
Calculate the exact WCAG contrast ratio with full step-by-step formula working.
CSS & Frontend
Favicon Generator
Create favicon PNGs in all sizes — 16 to 512 px — right in your browser.
robots.txt Validator
Validate a robots.txt file and test URL matching against user-agents
CSS Variable Theme Generator
Complete CSS custom property themes for design systems
CSS Grid System Generator
Custom CSS grid configurations for layouts
Lat/Lng to UTM Converter
Convert geographic coordinates to UTM zone, easting and northing
CSS Class Name Generator
BEM and utility-style CSS class names
UTM to Lat/Lng Converter
Convert UTM zone, easting and northing back to decimal lat/long
robots.txt Generator
Generate a robots.txt with allow, disallow, crawl-delay and sitemap.
Meta Tags Generator
Generate SEO, Open Graph and Twitter Card meta tags for any page.
CSS Specificity Calculator
Calculate the specificity of any CSS selector as an (a, b, c) score.
CSS Minifier
Compress stylesheets by stripping comments and whitespace.
CSS Flexbox Cheatsheet
Every flexbox property, grouped and searchable — copy any one-liner.
CSS Grid Cheatsheet
Every CSS grid property, grouped and searchable — copy any one-liner.
CSS Properties Reference
Common CSS properties grouped by purpose and searchable.
CSS Border Radius Generator
Round corners individually or together with a live preview.
CSS Transform Generator
Combine translate, rotate, scale and skew with a live preview.
CSS Filter Generator
Blur, brightness, contrast, grayscale, sepia and more — live preview.
CSS Clip-Path Generator
Polygon clip-path shapes — triangles, hexagons, stars and custom.
CSS Glassmorphism Generator
Frosted-glass cards with backdrop-filter blur, tint and border.
Cubic Bezier Generator
Drag the curve to craft custom cubic-bezier() easing for CSS.
CSS Animation Keyframes Generator
Fade, slide, bounce, spin and shake @keyframes with live preview.
Favicon Kit Generator
Turn one image into a complete favicon set — ICO, PNGs, manifest and zip.
Spreadsheet Lite — Online Grid with Formulas
A fast browser spreadsheet with SUM/AVG formulas and CSV + XLSX import & export.
UTM Link Builder
Build tagged campaign URLs with utm_source, utm_medium and more.
Canonical URL Builder
Normalise a URL and build its rel=canonical tag.
CSS Grid Generator
Build a CSS grid layout visually and copy the code.
CSS Flexbox Playground
Experiment with flexbox properties and copy the CSS.
CSS Triangle Generator
Make CSS triangles with the border trick and copy the code.
CSS Scrollbar Styler
Style custom scrollbars and copy cross-browser CSS.
CSS Variables Generator
Build a :root block of CSS custom properties and copy it.
CSS Unit Converter
Convert between px, rem, em, pt, pc and physical CSS units.
CSS Animation Builder
Multi-stop @keyframes editor with a live preview and copy-ready CSS.
CSS clamp() Generator
Turn min/max sizes and a viewport range into a responsive clamp() value.
CSS Aspect Ratio and object-fit Helper
Visualize aspect ratios and object-fit, then copy ready-to-paste CSS.
Cubic Bezier Easing Editor
Drag, preview and export cubic-bezier() easing curves for CSS.
CSS Grid Layout Builder
Paint named template areas, size every track, copy grid-template CSS.
Border Radius Generator (Elliptical, Per-Corner)
Design rounded and elliptical corners with live preview and copy-ready CSS.
Flexbox Playground
Visually build a CSS flexbox layout and copy the exact HTML and CSS.
CSS Formatter & Minifier
Beautify, minify and tidy CSS in your browser — sort properties, shorten hex, copy.
CSS Pattern Generator
Build repeating geometric backgrounds — stripes, dots, grids, checks — and copy the CSS.
Robots Meta Tag Generator
Generate correct robots meta tags with indexing, follow and snippet controls.
Sitemap URL Counter
Paste any sitemap.xml and instantly count every URL with full metadata analysis.
Canonical Tag Checker
Validate your canonical link tag and catch canonicalisation errors instantly.
Generators
Barcode Generator (EAN / Code 128 / Code 39 / UPC)
Generate EAN-13, UPC-A, Code 39, and Code 128 barcodes as scalable SVG.
Unified Diff to Patch File Generator
Create a .patch file from two pasted text versions, with line context.
CSP Nonce Generator
Generate cryptographically random nonces for Content Security Policy script/style tags
Password Strength Checker
Estimate password entropy, detect weak patterns, and see time-to-crack — locally.
SSH Key Pair Generator
Generate Ed25519 or RSA SSH key pairs entirely in your browser.
CHANGELOG Entry Generator
Keep-a-changelog format release notes
Fake Address Generator (Australia)
Valid-format Australian addresses for testing
Fake Address Generator (Brazil)
Brazilian addresses with CEP and state codes
Fake Address Generator (Canada)
Realistic Canadian addresses for QA and demos
Fake Address Generator (France)
French addresses with valid postal codes
Fake Address Generator (Germany)
German addresses with correct PLZ format
Fake Address Generator (India)
Indian addresses with PIN codes and states for testing
Fake Address Generator (Japan)
Japanese addresses in kanji and romaji formats
Fake Address Generator (Spain)
Spanish addresses with province and postal codes
Fake Address Generator (UK)
Plausible UK addresses with valid postcodes
Fake Address Generator (US)
Realistic US addresses for testing and forms
Fake Analytics Dashboard Data Generator
Realistic web analytics data for dashboard demos
Audit Log Entry Generator
Fake audit trail entries for compliance tool demos
Fake Background Check Result Generator
Fictional background check summaries for HR demos
Fake Certificate Thumbprint Generator
SHA-1 and SHA-256 thumbprint format strings
CI Pipeline Output Generator
Fake CI/CD build log output for tool demos
Fake Company Generator
Fictional company names and details for demos
Fake Company Registration Number Generator
Company number format stubs for business tool demos
Fake Contract Clause Generator
Fictional legal clause text for legal tool demos
Random GPS Coordinates Generator
Valid latitude/longitude pairs for geospatial testing
Fake Credit Card Generator (Test)
Luhn-valid test card numbers, never real cards
CRM Contact Record Generator
Fake contact records for CRM tool demos
Fake Crypto Portfolio Generator
Fictional crypto holdings for wallet app demos
Fake DOI Generator
DOI-format identifiers for academic tool testing
Fake Email Generator
Disposable-style fake emails for test data
Fake Git Commit History Generator
Synthetic git log output for tool demos
Fake IBAN Generator (Test)
Valid-format IBAN numbers for testing bank flows
Fake ISBN Generator
Check-digit-valid ISBN-13 strings for book demos
Fake UK License Plate Generator
DVLA-format number plates for UK auto apps
Fake US License Plate Generator
State-format license plates for automotive apps
Fake LinkedIn Profile Generator
Professional profile data for B2B tool mockups
Markdown Document Generator
Fake documents with all Markdown elements
Fake Medical Record Generator
Anonymized fake patient records for health demos
NPS Survey Data Generator
Net Promoter Score datasets for analytics demos
Fake Order History Generator
Synthetic order data for e-commerce app demos
Fake Passport Number Generator
Country-specific passport number format stubs
Fake Person Profile Generator
Complete fictional identity for testing and demos
International Fake Phone Number Generator
Country-code formatted test phone numbers worldwide
Fake UK Phone Number Generator
UK phone numbers in Ofcom-reserved drama ranges
Fake US Phone Number Generator
NANP-format US phone numbers for safe testing
Fake Purchase Order Generator
Fictional POs for procurement tool testing
SaaS Subscription Record Generator
Fake subscription data for SaaS analytics demos
Fake Sensor Log Generator
Simulated sensor log files for IoT testing
Fake Social Media Stats Generator
Believable follower and engagement counts for mockups
Fake SSH Key Fingerprint Generator
MD5 and SHA-256 SSH fingerprint format strings
Fake SSN Generator (US Test Format)
Invalid-by-design SSN-format strings for testing
Fake Stock Price Generator
Fictional ticker symbols and price history
Support Ticket Generator
Fake customer support tickets for helpdesk demos
Survey Response Dataset Generator
Fake survey response datasets for analytics demos
Fake Terraform Plan Output Generator
Simulated Terraform plan output for IaC demos
Fake Time-Series Data Generator
Synthetic time-series datasets for charting demos
Fake Twitter/X Profile Generator
Fictional social profile data for UI mockups
Fake VAT Number Generator
EU VAT number format strings for tax tool testing
Fake Vehicle VIN Generator
Check-digit-valid VIN strings for auto testing
Webhook Payload Generator
Realistic webhook event payloads for testing
.htaccess Generator
Apache .htaccess rules for redirects and security
IP Address Generator
Random IPv4 and IPv6 addresses for testing
MAC Address Generator
Valid random MAC addresses for network testing
Mock .env File Generator
Fake environment variable files for dev setup
Mock GraphQL Response Generator
Fake GraphQL query responses for frontend dev
N-gram Generator
Extract character and word n-grams from any text.
TOTP Secret Generator
Base32 OTP secrets for authenticator apps
Placeholder Name Generator (Mx. / Gender-Neutral)
Gender-neutral placeholder names for inclusive demos
Random API Response Generator
Fake REST API JSON responses for frontend mocking
AWS Resource Name Generator
Naming-convention-compliant AWS resource identifiers
Random Blog Post Generator
Fake blog post stubs for CMS and content demos
Random Calendar Event Generator
Fake calendar events for scheduling tool demos
Random Chat Message Generator
Fake chat conversations for messaging app demos
Random Git Commit Message Generator
Conventionally-formatted fake commit messages
Cron Expression Generator
Valid cron schedule expressions with human description
Random Currency Code Generator
ISO 4217 currency codes for finance testing
D3.js Sample Data Generator
Ready-to-use sample data for D3 chart types
Database Name Generator
Professional database and schema name suggestions
Design Token Set Generator
Complete design token collections for design systems
Docker Tag Generator
Versioned Docker image tags for CI pipelines
E-commerce Product Review Generator
Realistic fake product reviews for shop demos
Election Result Generator
Fictional election results for civic tech demos
Random Error Message Generator
Fake error messages for QA and UI testing
Application Error Code Generator
Structured error codes for API and app error systems
Analytics Event Name Generator
Consistent analytics event names for tracking plans
Feature Flag Name Generator
Consistent flag names for feature toggle systems
Flight Data Generator
Fake flight listings for travel app mockups
Forum Post Generator
Fake forum threads and replies for community demos
GitHub Repository Name Generator
Kebab-case repo names for your next project
Heatmap Data Generator
Matrix data for heatmap chart visualizations
Hotel Listing Generator
Fake hotel listings for travel platform demos
Random HTTP Header Generator
Standard HTTP header name-value pairs
Random HTTP Status Code Generator
HTTP status codes with explanation and use case
Random Invoice Generator
Fake invoice data for accounting tool mockups
Random Job Posting Generator
Fake job descriptions for HR and recruiting tools
Kanban Board Data Generator
Fake kanban card data for PM tool prototypes
Kubernetes Resource Name Generator
DNS-compliant Kubernetes resource names
Random Locale Code Generator
BCP-47 locale codes for i18n testing
Random MIME Type Generator
IANA MIME type strings for file handling tests
Network Graph Data Generator
Node and edge data for network graph demos
News Feed Data Generator
Fake news article feeds for app mockups
Random Push Notification Generator
Fake push notifications for mobile app mockups
npm Package Name Generator
Valid npm package names for your next library
Open Graph Meta Tags Generator
og: meta tag snippets for social sharing previews
Org Chart Data Generator
Hierarchical team structures for HR app demos
Password Policy Generator
Password policy rule sets for security configs
Permission Scope Name Generator
OAuth-style scope strings for auth systems
Privacy Policy Clause Generator
Plain-language privacy policy clauses for demos
Random Product Review Generator
Fake product reviews for e-commerce mockups
Project Timeline Generator
Fake project milestones for PM tool demos
Random Regex Pattern Generator
Common regex patterns for validation tasks
Semantic Version Generator
Valid semver version strings for package releases
Social Media Feed Generator
Fake social timeline posts for UI mockups
Sports Score Generator
Realistic fake scores for sports app mockups
Random Tech Stack Generator
Random technology stack combos for side projects
Terms of Service Clause Generator
ToS clause stubs for legal document tool demos
Random Timezone Generator
Random IANA timezone identifiers for testing
Tree Structure Data Generator
Hierarchical JSON trees for visualization demos
Two-Factor Backup Code Generator
2FA backup code sets for auth system testing
Random User Agent Generator
Realistic browser user-agent strings for testing
Random Variable Name Generator
Context-appropriate variable name suggestions
Weather Data Generator
Fake weather readings for climate app demos
Word Cloud Data Generator
Frequency-weighted word lists for word cloud tools
README Badge Generator
Shields.io-style badges for GitHub README files
Recovery Codes Generator
Backup recovery codes for 2FA systems
Password Salt Generator
Random cryptographic salts for password hashing
Sample E-commerce Dataset Generator
Fake product catalog data for shop demos
Sample Finance Dataset Generator
Fake transaction and account data for fintech demos
Sample Healthcare Dataset Generator
Anonymized fake patient records for health-tech demos
Sample HR Dataset Generator
Fake employee records for HRIS tool demos
Sample IoT Sensor Dataset Generator
Fake time-series sensor readings for IoT demos
Spacing Scale Generator
Consistent spacing scales for design systems
Secure Token Generator
Cryptographically random tokens for auth systems
Word Frequency List Generator
Generate a Zipf-distributed word frequency list of any size.
.gitignore Generator
Build a .gitignore from language, OS and editor templates.
URL Slug Generator
Turn any title into a clean, SEO-friendly URL slug.
Random PIN Generator
Generate secure random numeric PINs of any length, right in your browser.
Pronounceable Password Generator
Create strong passwords you can actually say and remember.
API Key Generator
Generate secure random API keys in hex, base62 or base64url, with an optional prefix.
htpasswd Generator
Create Apache/Nginx .htpasswd entries with APR1 (MD5) or SHA-1 hashing.
Random Username Generator
Generate memorable usernames from random adjectives and nouns.
Strong Passphrase Generator
Build memorable, high-entropy passphrases from random words.
Random Date Generator
Generate random dates within any range and format.
Modular Scale Generator
Build a harmonious type scale from a base size and ratio.
Design Tokens Generator
Turn a base colour into a full tint/shade ramp and exportable design tokens.
Test Credit Card Number Generator
Luhn-valid fake card numbers for sandbox & form testing.
Random MAC Address Generator
Valid random MAC addresses in any format — colon, hyphen, Cisco.
Random IP Address Generator
Random IPv4 & IPv6 addresses, public-only option included.
Random User Generator
Fake people with name, email, phone & address for test data.
Mock Data Generator
Define typed fields, generate thousands of realistic rows, export JSON, CSV or SQL.
Password Entropy Calculator
Measure password strength in bits and estimated time to crack.
Dockerfile Generator
Build a clean, cache-friendly Dockerfile from a stack preset — copy or download.
Nginx Config Generator
Build a production-ready nginx server block from simple options.
Advanced Password Generator
Cryptographically random passwords with a live entropy and strength meter.
Slugify Tool — Text to URL Slug Generator
Turn any title into a clean, URL-safe slug with full control.
India PIN Code Validator
Instantly check whether an Indian PIN code is structurally valid.
Philippines Phone Number Validator
Validate any Philippine mobile or landline number — network, area code and E.164 format.
Open Graph Preview Generator
See exactly how your link card looks on Facebook, Twitter, Slack, and Discord before you publish.
Hreflang Tag Generator
Generate correct hreflang tags for every international page in seconds.
URL Slug Generator for SEO
Turn any page title into a clean, search-engine-friendly URL slug instantly.
Formatters & Minifiers
PEM Private Key Format Validator
Paste a PEM key to verify its type and structure without transmitting it
Coordinate Format Converter
Convert between decimal degrees, DMS, DDM, UTM, and Geohash
JavaScript Formatter / Beautifier
Format minified or messy JavaScript with clean indentation in the browser
JavaScript Minifier
Minify JavaScript by stripping comments and whitespace — no upload
Nginx Config Formatter
Format and validate Nginx configuration files in your browser
Terraform HCL Formatter
Format Terraform .tf HCL files with canonical indentation in your browser
Coordinate Formatter (Multi-format)
Display one coordinate in DD, DMS, DDM, UTM, and MGRS simultaneously
India GSTIN Validator
Validate a 15-character GSTIN — state code, PAN and base-36 check digit.
HTML Formatter & Minifier
Pretty-print or minify HTML in your browser — nothing is uploaded.
JavaScript Minifier
Strip comments and whitespace to shrink your JS.
HTML Minifier
Shrink HTML by removing comments and collapsing whitespace.
ISO 8601 Date Formatter
Format any date as a standards-compliant ISO 8601 string.
Reference & Cheatsheets
Regex Tester with Plain-English Explainer
Test regular expressions live and see them explained in plain English.
Regex Builder & Tester
Build, test and debug regular expressions with live match highlighting.
HTTP Status Code Reference & Security Implications
Look up any HTTP status code with security and caching implications explained
HAR to cURL Commands Converter
Convert HTTP Archive requests to copy-pasteable cURL commands.
MIME Type Inspector & Security Risk Checker
Enter a MIME type or file extension and get security, sniffing, and CSP guidance
MIME Type Lookup & File Extension Map
Look up MIME type from extension or extension from MIME type
Regex Redaction Tester
Write a redaction regex, test it against sample text, and see matched and missed spans
ASCII Code Table Lookup
Look up any ASCII character by code or letter
HTTP Status Codes Reference
Every HTTP status code with its meaning — searchable and instant.
MIME Types Reference
Look up the right Content-Type for any file extension — searchable.
Git Commands Cheatsheet
The everyday Git commands, grouped and searchable — copy any one.
Linux Commands Cheatsheet
The everyday Linux terminal commands, grouped and searchable — copy any one.
Docker Commands Cheatsheet
The everyday Docker commands, grouped and searchable — copy any one.
Regex Replace Tool
Find and replace with regular expressions and capture groups.
ISO Country Codes Reference
Look up ISO 3166-1 alpha-2, alpha-3 and numeric country codes.
ISO Currency Codes Reference
Look up ISO 4217 currency codes, numbers and minor units.
International Calling Codes Reference
Find the international dialling (country) code for any country.
Time Zone List Reference
Browse IANA time zone names and their UTC offsets.
ISO Language Codes Reference
Look up ISO 639-1 and 639-2 language codes and native names.
HTML Tags Reference
Every common HTML element grouped and searchable.
File Extensions Reference
Common file extensions and what they mean — searchable.
Port Numbers Reference
Well-known TCP and UDP ports and their services — searchable.
Emoji Shortcodes Reference
GitHub and Slack emoji shortcodes — searchable, click to copy.
DNS Record Types Reference
Searchable list of DNS record types — A, AAAA, CNAME, MX, TXT and more.
Regex Syntax Reference
Searchable cheat sheet of regular-expression tokens, quantifiers and flags.
Markdown Syntax Reference
Searchable cheat sheet of Markdown syntax — headings, emphasis, lists, links and code.
Vim Commands Cheat Sheet
Searchable cheat sheet of Vim commands — modes, motion, editing, search and files.
Unicode Blocks Reference
Common Unicode blocks with their code-point ranges and contents.
HTTP Methods Reference
GET, POST, PUT and the rest — safe, idempotent, cacheable.
ASCII Control Codes Reference
The 33 ASCII control characters — abbr, caret and escape.
HTTP Status Codes Reference
Searchable list of HTTP status codes with meaning and when to use each.
ASCII Table Reference
Every ASCII code in decimal, hex, octal, binary and HTML entity — searchable, click-to-copy.
MIME Type Finder
Look up the MIME type for any file extension — or vice versa.
HTTP Headers Reference
Searchable list of HTTP request and response headers with purpose, example and direction.
Regex Cheatsheet & Tester
A categorized regex token reference plus a live, highlighting tester.
Git Command Builder
Pick an action — branch, stash, undo, rebase — and get the exact git command plus a plain-English explanation.
ID & Number Validators
IP Address Type & Privacy Checker
Classify any IPv4/IPv6 address as public/private/loopback/reserved/documentation
SPF Record Builder & Syntax Checker
Build a valid SPF TXT record from a guided UI and validate the syntax offline
Clipboard Contents Security Checker
Read your clipboard (with permission) and scan it for secrets, tokens, and PII before you paste
CORS Header Explainer & Validator
Paste CORS response headers and get a plain-English breakdown of what they allow
Data URI Inspector & Security Checker
Decode any data URI and flag potentially dangerous MIME types or obfuscated payloads
Folder Listing Diff
Paste two directory listings and find files added, missing, or renamed
HSTS Header Checker
Paste a Strict-Transport-Security header and verify max-age, subdomains, and preload
Luhn Algorithm Checker
Validate card numbers with the Luhn mod-10 check and generate test numbers.
OpenAPI / Swagger Spec Validator
Validate an OpenAPI 3.x or Swagger 2.0 YAML or JSON spec in your browser.
API Rate-Limit Header Calculator
Design a rate-limiting policy and preview the X-RateLimit headers it would produce.
RSS / Atom Feed Validator
Validate a pasted RSS 2.0 or Atom 1.0 feed for spec compliance
Same-Origin Policy Checker & Explainer
Enter two URLs and instantly see whether they share an origin, with a full explanation
Damm Algorithm Checker
Validate numbers using the Damm totally antisymmetric quasigroup
EAN-13 / UPC-A Barcode Validator
Validate EAN-13 and UPC-A barcodes and compute check digits
IMEI Number Validator
Validate mobile device IMEI numbers via Luhn algorithm
ISBN-10 to ISBN-13 Converter
Convert any valid ISBN-10 to its ISBN-13 equivalent
ISBN-10 Validator & Check Digit
Validate ISBN-10 and compute missing check digits
ISBN-13 Validator & Check Digit
Validate ISBN-13 (EAN-13) and compute missing check digits
ISO-8859-2 / Latin-2 Encoder
Show Central European Latin-2 byte values for text in hex
ISO-8859-1 / Latin-1 Encoder
Encode text to an ISO-8859-1 byte sequence shown as hex
Luhn Algorithm Checker
Validate credit card numbers and IMEI via Luhn mod-10
Verhoeff Checksum Checker
Validate digits using the dihedral group Verhoeff algorithm
Text Diff Checker
Compare two blocks of text line by line and highlight every change.
Luhn Algorithm Checker
Validate any number with the Luhn (mod-10) checksum.
IBAN Validator
Check any IBAN with the ISO 13616 mod-97 algorithm.
Credit Card BIN Checker
Identify the card network from a BIN / IIN prefix.
EU VAT Number Validator
Check the format of any EU VAT number — all 27 member-state patterns.
UK VAT Number Validator
Verify a UK VAT number's check digit with HMRC's mod-97 algorithm.
Australian ABN Validator
Check an 11-digit ABN with the ATO's mod-89 checksum algorithm.
ISBN Validator
Validate ISBN-10 and ISBN-13 check digits and convert between them.
Semver Range Checker
Check whether a version satisfies an npm semver range like ^1.2.0.
Russia INN Validator
Check a Russian INN (10 or 12 digit) check digits — in your browser.
Ukraine INN Validator
Decode a Ukrainian tax number (RNOKPP) — date, gender and checksum.
Serbia JMBG Decoder
Decode a Serbian JMBG — date of birth, region, gender and checksum.
Austria SVNR Validator
Decode an Austrian social-security number — date and check digit.
Meta Title Length Checker
Check title-tag length in characters and approximate SERP pixels.
Keyword Density Checker
Count word frequency and density in any text to avoid keyword stuffing.
IEEE 754 Floating-Point Converter
Decimal to IEEE 754 single and double precision bits.
Credit Card Validator
Luhn checksum plus card-brand detection — all in your browser.
India PAN Validator — Check Every Rule in Your PAN
Validate all structural rules in an Indian PAN and decode every embedded field.
Poland PESEL Validator
Verify any Polish PESEL number — checksum, birth date, gender, century.
India Aadhaar Number Validator
Verify any 12-digit Aadhaar with a full Verhoeff checksum and step-by-step trace.
Brazil CNPJ Validator
Verify Brazilian company ID numbers with the real two-step mod-11 algorithm.
Croatia OIB Validator
Verify a Croatian OIB with the ISO 7064 MOD 11,10 check digit — and see every step.
Brazil CPF Validator
Validate a CPF with real MOD-11 check digits, see the algorithm step by step, and decode the embedded fiscal region.
Canada SIN Validator — Social Insurance Number Checker (Luhn)
Validate a Canadian SIN with the Luhn checksum and read its province or temporary-resident flag.
Czech Rodné číslo Validator
Validate a Czech birth number and decode its hidden birth date and gender.
Denmark CPR Number Validator
Validate a Danish CPR number — date, serial, century, gender and legacy mod-11 check.
Estonia Isikukood Validator
Verify an Estonian personal ID code — control digit, birth date and gender decoded instantly.
Finland HETU Validator
Validate a Finnish henkilötunnus with the full DVV mod-31 algorithm.
Ireland PPS Number Validator
Validate an Irish PPSN with full modulo-23 check-character verification and step-by-step working.
Italy Codice Fiscale Validator
Validate an Italian tax code with full checksum verification and decoded birth data.
Norway Fødselsnummer Validator
Validate a Norwegian national ID number with full mod-11 checksum verification.
South Korea RRN Validator
Verify a Korean Resident Registration Number with the real mod-11 check-digit algorithm.
Spain DNI / NIE Validator
Verify a Spanish DNI or NIE in one click — control letter, mod-23 algorithm explained.
Sweden Personnummer Validator
Validate a Swedish personal identity number and extract birth date, gender and county.
Romania CNP Validator
Validate a Romanian CNP and decode birth date, gender and county.
Bulgaria EGN Validator
Validate a Bulgarian EGN with weighted-checksum verification and birth-date + region extraction.
Lithuania Asmens Kodas Validator
Verify any Lithuanian personal code and extract birth date, gender and century.
Mexico CURP Validator
Verify any 18-character CURP with the real RENAPO check-digit algorithm and decode birth date, gender and state.
Albania NID Validator
Validate an Albanian Personal Number (NUP) and read its embedded birth date, gender and citizen type.
Colombia NIT Validator
Compute and verify the DIAN check digit for any Colombian NIT.
Iceland Kennitala Validator
Verify an Icelandic kennitala with the official Lund weighted mod-11 check digit.
Taiwan National ID Validator
Verify a ROC National ID number and decode its embedded district and gender.
Germany Personalausweis Document-Number Validator
Verify the 9-character German national ID document number using the ICAO 9303 check-digit algorithm.
Malaysia MyKad Validator
Validate a 12-digit MyKad number: date, place of birth, gender and serial.
North Macedonia EMBG Validator
Validate a Macedonian EMBG and decode birth date, gender and region.
Serbia JMBG Validator
Validate a Serbian JMBG number with full modulo-11 checksum and decoded fields.
Slovenia EMŠO Validator
Verify any Slovenian EMŠO number and decode its birth date, gender, and region.
Ukraine RNOKPP Validator
Verify a Ukrainian tax number and decode its embedded birth date, gender and checksum.
Uruguay CI Validator
Verify the check digit on a Uruguayan Cédula de Identidad instantly.
Argentina CUIL Validator
Verify an Argentine CUIL with the ANSES mod-11 checksum and decode the type prefix.
Egypt National ID Validator
Validate a 14-digit Egyptian National ID and decode its birth date, governorate and gender.
Greece AMKA Validator
Validate a Greek social security number with the full Luhn checksum algorithm.
Kazakhstan IIN Validator
Validate a Kazakhstan IIN with two-pass checksum verification and birth-date, gender and century extraction.
Morocco CIN Validator
Validate a Moroccan national ID number and decode the issuing bureau.
Thailand National ID Validator
Verify a 13-digit Thai national ID against the official DOPA check-digit formula.
Netherlands BSN Validator
Verify a Dutch Burgerservicenummer with the full elfproef (11-test) breakdown.
Portugal NIF Validator
Validate a Portuguese NIF with mod-11 check digit — see WHY it passes or fails.
Canada Postal Code Validator
Instantly check whether a Canadian postal code is structurally valid.
France Phone Number Validator
Validate any French phone number against the ARCEP national plan — instantly, in your browser.
Germany Postcode Validator
Instantly validate any German PLZ and identify its federal state and region.
Austrian IBAN Validator
Instantly validate any Austrian IBAN — BLZ, account number and ISO 7064 checksum.
Belgian IBAN Validator
Verify a Belgian IBAN with ISO mod-97 and the national check digits.
Danish IBAN Validator
Instantly verify any Danish bank account number in IBAN format.
German IBAN Validator
Validate a German IBAN with ISO 7064 MOD-97, BLZ structure and Kontonummer checks.
Italian IBAN Validator
Validate any Italian IBAN instantly — CIN, ABI, CAB and MOD-97 checksum checked.
Luxembourg IBAN Validator
Instantly verify any Luxembourg IBAN against the ISO 7064 MOD-97-10 standard.
Norwegian IBAN Validator
Validate any Norwegian IBAN with Modulus-11 and ISO 7064 checks.
Polish IBAN Validator (NRB)
Validate any Polish IBAN instantly — checksum, bank code and branch decoded.
Saudi Arabia IBAN Validator
Instantly verify any SA IBAN against ISO 7064 MOD-97 and the SAMA bank-code registry.
Swedish IBAN Validator
Instantly verify any Swedish bank account number in IBAN format — ISO 7064 checksum, clearing number and bank name included.
Netherlands Postcode Validator
Instantly check whether a Dutch postcode is structurally valid.
Pakistan Phone Number Validator
Verify any Pakistani mobile or landline number — format, operator, city.
UK Phone Number Validator
Instantly check if a UK phone number is valid, identify its service type and get the correct formatted versions.
US Phone Number Validator
Instantly check whether a US phone number is structurally valid under NANP rules.
US ZIP Code Validator
Validate any US ZIP-5 or ZIP+4 code with prefix-range and state lookup.
France Postcode Validator
Validate any French postcode (code postal) and instantly identify the department and region.
Netherlands IBAN Validator
Verify any Dutch IBAN with the full NL BBAN structure check and ISO 7064 MOD-97 algorithm.
Australia Phone Number Validator
Validate any Australian phone number against the ACMA Numbering Plan — mobile, geographic, freecall and more.
Bangladesh Phone Number Validator
Instantly check any Bangladeshi mobile number format and identify the operator.
Brazil CEP Validator
Validate a Brazilian postal code, decode its state and macro-region, and classify the suffix type — all offline.
Germany Phone Number Validator
Validate any German phone number — landline, mobile, or service number — and get the correct E.164 format instantly.
Greek IBAN Validator
Validate any Greek IBAN instantly — bank code, branch code and MOD-97 checksum verified.
Irish IBAN Validator
Validate an Irish IBAN with full MOD-97 checksum verification and BBAN structure breakdown.
Swiss IBAN Validator
Validate a Swiss IBAN with ISO 7064 MOD-97, IID structure and account format checks.
Indonesia Phone Number Validator
Validate any Indonesian mobile or landline number against the BRTI numbering plan.
Japan Postal Code Validator
Validate any Japanese 7-digit postal code and identify its prefecture instantly.
Kenya Phone Number Validator
Instantly check any Kenyan phone number format, operator and E.164 form.
Nigeria Phone Number Validator
Instantly check if a Nigerian phone number is valid and identify the network operator.
South Africa Phone Number Validator
Instantly validate and format any South African phone number — local, E.164 or +27 prefix.
UK Postcode Validator
Instantly check any UK postcode against the Royal Mail format spec and see the area, district, sector and unit breakdown.
Portugal IBAN Validator
Validate a Portuguese IBAN with ISO mod-97 + Banco de Portugal local check digits.
Australia Postcode Validator
Check any 4-digit Australian postcode against the Australia Post Addressing Standard — state, delivery type and allocation confirmed instantly.
Brazil Phone Number Validator
Validate any Brazilian phone number against ANATEL E.164 rules — area code, mobile 9th digit, and line type decoded instantly.
Egypt Phone Number Validator
Instantly verify any Egyptian phone number and identify the mobile operator or governorate.
French IBAN Validator
Verify a French IBAN with the RIB key check and ISO 7064 mod-97.
UAE IBAN Validator
Verify any United Arab Emirates IBAN with the full ISO 7064 MOD-97-10 checksum.
India Phone Number Validator
Validate any Indian mobile or landline against the TRAI numbering plan — operator, circle, and E.164 format included.
Spain IBAN Validator
Validate a Spanish IBAN — MOD-97 checksum + both internal CCC check digits explained.
Turkey TC Kimlik No Validator
Verify the two check digits of a Turkish national ID number instantly.
Turkey IBAN Validator
Validate a Turkish IBAN — MOD-97 checksum, bank code lookup and full BBAN breakdown.
Finnish IBAN Validator
Instantly verify any Finnish bank account number in IBAN format — ISO 7064 checksum, bank code and issuing bank included.
China Resident ID Validator
Verify an 18-character Chinese Resident Identity Card number and decode its embedded data.
Meta Description Length Checker
Instantly see if your meta description is the right length for Google.
Title Tag Length Checker
Check whether your HTML title tag fits Google's SERP display limit.
SEO & Web
More Developer Tools
Merge PDF
Combine multiple PDFs into one, drag to reorder, download — nothing uploaded.
Cron Expression Explainer
Translate any cron expression into plain English — and build your own.
TCF Consent String Encoder (IAB v2.x)
Build and encode a valid IAB TCF v2 consent string from selected purposes and vendors
Cookie Inspector & SameSite Auditor
List this page's cookies and audit a pasted Set-Cookie header for security flags
DKIM Record Builder
Assemble a DKIM TXT record from key, version, and service type fields
DMARC Record Builder & Policy Explainer
Build a DMARC TXT record and get a plain-English explanation of each tag
Email Header Analyzer
Paste raw email headers and get SPF, DKIM, DMARC results and routing hops
IPv4/IPv6 CIDR Range Calculator
Enter a CIDR and get network address, broadcast, host range, and usable IPs
localStorage / sessionStorage Inspector
View, search, and flag tracker-pattern keys in your browser web storage
NATO Phonetic Alphabet Converter
Spell any word or code in the NATO phonetic alphabet.
TCF Consent String (IAB) Decoder
Decode any IAB TCF v2.x base64 consent string into human-readable purpose consents
Android APK Inspector
Inspect an APK's manifest, permissions and version code in your browser
BPM Detector
Detect beats-per-minute of an audio file using Web Audio API analysis
Audio Sample Rate Converter
Resample audio to 44100 / 48000 / 22050 Hz in your browser
Audio Waveform Viewer
Visualise a WAV or MP3 waveform locally — no upload, no flash
BiDi / RTL Text Inspector
Reveal hidden Unicode BiDi control characters in text or filenames.
Binary File Inspector
Inspect any binary: extracted strings, byte histogram and entropy heatmap.
BMP / ICO File Inspector
Inspect BMP DIB header and ICO directory — size, bit depth, color planes
Browser Fingerprint Preview
See what fingerprinting signals your browser exposes — without sending any data anywhere
CAA DNS Record Builder
Build a Certification Authority Authorisation DNS record to control who can issue your TLS certs
TLS Certificate Decoder (PEM)
Paste a PEM certificate and see subject, SANs, validity, and signature algorithm
Content Negotiation & Accept Header Builder
Build a valid Accept header with quality factors and explain each q-value
Content Security Policy (CSP) Header Builder
Build a valid CSP header from a guided directive UI with inline explanations
Data URI to File Converter
Decode a base64 data URI and download the binary file
DNS Zone File Parser
Parse BIND-format DNS zone files and display records as a structured table.
Dockerfile Linter
Lint a Dockerfile for best-practice violations and security issues
DOCX Metadata Viewer
Read a Word document's author, dates and revision count without opening Word.
EBML / Matroska Inspector
Inspect MKV / WebM container structure and track metadata locally
Browser Entropy Source Tester
Verify that crypto.getRandomValues works in the current browser environment
EPUB Metadata Viewer
Read title, author, ISBN, and cover from an EPUB file locally.
Excel Formula Parser & Explainer
Paste an Excel formula and get a tree breakdown of what it does
Fixed-Width File Parser
Define column widths and parse fixed-width text files to CSV or JSON
FLAC Metadata Viewer
Read FLAC STREAMINFO and Vorbis comment tags locally
Font Metadata Viewer
Read name-table entries — family, version, copyright, licence — from a font file.
Local Font Previewer
Preview a TTF, OTF, or WOFF2 font file locally before installing it.
GPX Elevation & Distance Stats
Ascent, descent, distance, and pace from any GPX file
GPX Activity Heatmap
Overlay multiple GPX tracks as a heat map — local, no Strava required
GPX Lap Timer
Define a start/finish line in your GPX and auto-detect lap times
GPX Merger
Combine multiple GPX files into one track file in seconds
GPX Route Reverser
Reverse any GPX route or track and download the mirrored file
GPX Splitter
Split a GPX file by point count, time gap, or date boundary
GPX to FIT Converter (Garmin)
Convert a GPX track to a Garmin .fit activity file — entirely in your browser.
GPX to KML Converter
Convert GPX tracks and waypoints to Google Earth KML — fully private
GPX Track Simplifier
Reduce GPX track-point count with Ramer-Douglas-Peucker — keep shape, lose bloat
GPX Viewer
Visualise GPX tracks and waypoints — no account, no upload
HAR File Viewer
Browse HTTP Archive .har files and analyze request/response timings.
Homoglyph / Lookalike Character Detector
Find visually similar Unicode characters that could be used for phishing.
.htaccess to Nginx Rewrite Converter
Convert Apache .htaccess RewriteRule directives to Nginx config
HTML to PDF Converter (Local Print)
Save any pasted HTML as a PDF using the browser's print-to-PDF engine.
HTTP Response Header Analyzer
Paste raw HTTP headers and get a security and caching score with fixes.
HTTP Security Headers Grader
Paste response headers and get an A-F security grade with remediation advice.
ID3 Tag Viewer & Editor
Read and edit MP3 ID3v2 tags — title, artist, album, artwork — locally
JMESPath Tester
Test JMESPath expressions for AWS CLI and JSON querying in real time
KML to GPX Converter
Convert Google Earth KML to GPX for Garmin, Strava and mapping apps
M3U8 / HLS Playlist Parser
Parse and inspect HLS .m3u8 playlist files — segment list, bandwidths, keys
Magic Number / File Type Detector
Identify a file's true type from its magic bytes, not just its extension.
MessagePack Viewer
Decode MessagePack binary data to readable JSON right in your browser.
MP3 / Audio Silence Detector
Find silent segments in an audio file using the Web Audio API
OAuth 2.0 Scope Explainer & Risk Scorer
Paste an OAuth scope string and get a plain-English explanation and privacy risk score.
OGG / Vorbis Metadata Viewer
Read Vorbis comment tags from OGG audio files in your browser
OpenAPI Spec to Markdown Docs
Generate a Markdown API reference from an OpenAPI YAML or JSON spec.
Patch Applier
Apply a unified-diff .patch to your source text right in the browser.
PDF Form Field Inspector
List every AcroForm field, type, and value in a PDF — locally.
PDF Image Extractor
Extract all embedded images from a PDF as PNG files — no upload.
PDF Metadata Remover
Strip author, creator, and creation-date metadata from PDF files locally
PDF Page Reorder (Drag & Drop)
Drag PDF page thumbnails to reorder them, then download the result
PDF Page Rotator (Local)
Rotate individual or all pages in a PDF by 90° / 180° — no upload
PDF Text Redactor
Find and remove sensitive text from a PDF, entirely in your browser.
PDF to Plain Text Extractor
Extract readable text from a PDF file — private, no upload required
PDF Word Count
Count words, characters, sentences and pages in a PDF — locally in your browser.
PGP / OpenPGP Key Inspector
Inspect a PGP public key — User IDs, fingerprint, algorithm, subkeys.
macOS / iOS Plist Viewer
View binary or XML plist files from macOS or iOS apps in your browser
Google Polyline Encoder / Decoder
Encode lat/lon pairs to Google Encoded Polyline strings, and back
Postman Collection to OpenAPI Converter
Convert a Postman Collection v2.1 JSON to an OpenAPI 3.0 YAML spec
PEM / Private Key Inspector
Inspect a PEM certificate or key — type, algorithm, key size, and expiry.
QR Code Decoder
Decode a QR code image locally — no upload, no third-party API.
TAR / TAR.GZ Inspector
Browse tar and gzipped-tar archive contents without extraction tools.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates in any timezone.
TLS Certificate Decoder
Paste a PEM certificate and decode every X.509 field in your browser.
TLS Cipher Suite Decoder
Paste a cipher suite name or IANA code and get security rating and deprecation status
TTF to WOFF2 Converter
Compress a TTF or OTF font for the web — smaller files, no upload.
TypeScript Playground (Offline)
Compile TypeScript to JavaScript in your browser — no server, no tsc install
Unicode Character Inspector
Inspect every Unicode code point in a string — name, block, category.
vCard to LDIF Converter
Convert VCF contacts to LDIF format for LDAP and Active Directory import
Video File Metadata Viewer
Read codec, resolution, duration, and frame rate from video files locally
Video Thumbnail Extractor
Extract frames from a video file at configurable timestamps — no upload
WAV Header Inspector
Parse WAV/RIFF header to show sample rate, channels, bit depth, and duration
Webpack / Rollup Bundle Stats Visualizer
Visualize a webpack stats.json or rollup bundle as a treemap
WOFF2 to TTF Converter
Decompress a WOFF2 web font back to a usable TrueType/OpenType file.
ZIP File Inspector
Browse a ZIP archive's contents and metadata without extracting it.
G-Code Arc (I/J/K) Calculator
Generate G02/G03 I/J center-offset values from start, end, and radius
G-Code Drilling Cycle Calculator
Build G81/G83 canned-cycle blocks for any hole pattern depth and peck size
A1 ↔ R1C1 Notation Converter
Switch spreadsheet cell references between A1 and R1C1 style
Accent Fold (Search Normaliser)
Fold accented letters to ASCII base for search matching
Adler-32 Checksum Calculator
Fast Adler-32 checksum as used in zlib, PNG, and the deflate format
Arbitrary Base Converter
Convert any integer between bases 2 through 36 instantly
ASCII / Unicode Code to Character
Convert a decimal or hex code point to its character
B-Encoding (RFC 2047) Encoder
MIME header word encoding: =?UTF-8?B?...?= Base64 variant
Base-N Arithmetic Calculator
Add, subtract, multiply in any base from 2 to 36
Base122 Encoder/Decoder
Experimental ultra-dense 7-bit encoding for HTML and JS embedding
Base36 Encoder and Decoder
Encode integers to compact alphanumeric base-36 and decode them back
Base45 Encoder/Decoder
Compact QR-code-friendly encoding used in EU COVID passes
Base62 Encoder/Decoder
URL-safe alphanumeric encoding — 0-9, A-Z, a-z only
Base91 Encoder/Decoder
High-density printable encoding — denser than Base64
Base91 Encoder/Decoder
Encode binary data with the efficient Base91 alphabet
Baudot / ITA2 Encoder
Encode text to 5-bit Baudot teleprinter codes
Baudot / ITA-2 Encoder
Encode ASCII text to Baudot/ITA-2 5-bit teleprinter code
BCD (Binary-Coded Decimal) Converter
Encode decimal digits as 4-bit BCD nibbles
Excess-3 BCD Converter
Encode decimal digits in Excess-3 (Stibitz code) BCD format
bcrypt Cost Factor Estimator
Estimate bcrypt hashing time for each cost factor 4–18
Bech32 Encoder/Decoder
SegWit Bitcoin address and Lightning invoice encoding with BCH checksum
Bencode Encoder/Decoder
BitTorrent's bencode: strings, integers, lists, dicts
Big5 Encoder/Decoder
Traditional Chinese Big5 byte encoding and decoding
Binary Text Converter
Convert text to and from 8-bit binary 01010100 01100101…
Bit Parity Calculator
Determine even/odd parity of any integer's bit string
Bit Population Count (popcount)
Count the number of set (1) bits in any integer
Bit Shift Calculator
Left-shift and right-shift integers, with logical and arithmetic modes.
Bitwise Calculator
Compute AND, OR, XOR and NOT on integers in decimal, hex or binary.
BOM Add / Remove Tool
Insert or strip the UTF-8 BOM (EF BB BF) from text
camelCase Converter
Convert space, snake, or kebab text to camelCase identifier format
Caverphone Encoder
New Zealand phonetic encoding — better for NZ/Aus names
Character Frequency Map
Count every character and show descending frequency table
Character to ASCII / Unicode Code Converter
Get the decimal, hex, and octal codes for any character
Adler-32 Checksum Calculator
Compute the fast Adler-32 rolling checksum
Fletcher-16 Checksum Calculator
Compute the Fletcher-16 error-detection checksum
Fletcher-32 Checksum Calculator
Compute the Fletcher-32 error-detection checksum
Chord Keyboard Encoder
Map letters to stenography-style chord key combinations
Unicode Code Points to UTF-8
Compose Unicode code point sequences back into readable text
Cologne Phonetics (Kölner Phonetik)
German-optimised phonetic encoding for name matching
Cron Expression to Human Text
Translate a cron schedule expression into plain English
Data URI Encoder
Encode text or binary to a data: URI for inline embedding
Decimal Degrees ↔ Degrees Decimal Minutes
Convert between DD and DDM coordinate formats
Decimal Char Code Converter
Convert text to space-separated decimal char code points
DMS to Decimal Lat/Lng Converter
Convert degrees, minutes, seconds coordinates to decimal form
.NET DateTime Ticks Converter
Convert .NET DateTime ticks of 100-ns intervals to calendar dates
Double Metaphone Encoder
Primary and alternate phonetic codes for ambiguous pronunciations
DST Transition Date Finder
Find daylight saving start/end dates for any timezone and year
EBCDIC ↔ ASCII Converter
Convert between IBM EBCDIC and ASCII character encodings
EBCDIC Encoder/Decoder
Convert ASCII text to IBM EBCDIC code points and back
ECEF to Lat/Lng Converter
Convert Earth-Centered Earth-Fixed XYZ to lat/long/altitude
Endianness Swapper
Reverse byte order to convert between big-endian and little-endian hex.
Epoch Unit Converter
Convert epoch timestamps between seconds, ms, µs, and ns
Excel Column ↔ Number Converter
Convert Excel column letters (A, AB, ZZZ) to column numbers
Excel Serial Date Converter
Convert Excel and Lotus serial date numbers to calendar dates
Fixed-Point Converter
Convert real numbers to signed Qm.n fixed-point binary representation.
Fletcher-16 Checksum Calculator
Compute the Fletcher-16 two-byte checksum for data integrity
GB2312 / GBK Encoder/Decoder
Simplified Chinese GBK byte encoding and decoding
Geo URI Encoder
Format lat/lon/altitude as RFC 5870 geo: URI
Gray Code Converter
Convert binary integers to/from reflected Gray code
Gray Code Converter
Convert integers to Gray code and back — single-bit transitions
Hamming Distance Calculator
Count differing bit positions between two binary integers
Hamming(7,4) Encoder/Decoder
Add error-detecting parity bits using Hamming code
Homoglyph Detector
Highlight Unicode chars that look like ASCII but aren't
HTML Form URL Encoding
Encode form data using application/x-www-form-urlencoded rules
Hue Rotation Calculator
Rotate a color's hue by any degree offset around the color wheel
Human Text to Cron Expression
Convert plain-English schedules into valid cron syntax
bfloat16 Inspector
Inspect Google Brain's 16-bit bfloat16 floating-point format
IEEE-754 Float32 Inspector
Dissect 32-bit floating-point sign, exponent, and mantissa bits
IEEE-754 Float64 Inspector
Dissect the sign, exponent and mantissa bit fields of any 64-bit double.
IEEE-754 Float16 (Half) Inspector
Inspect 16-bit half-precision floating-point bit fields
Invisible Character Stripper
Remove zero-width spaces, soft hyphens, BOM, and other invisible chars
IPv4 Address ↔ Decimal Converter
Convert IPv4 dotted-quad notation to/from 32-bit decimal
IPv6 Address Expander/Compressor
Expand :: compressed IPv6 to full form and compress it back
IRI Encoder (RFC 3987)
Percent-encode an IRI to URI, preserving Unicode path chars
ISO 3166 Country Code Converter
Convert between ISO 3166-1 alpha-2, alpha-3, and numeric country codes.
ISO-8601 Date-Time Builder
Construct a valid ISO-8601 date-time string from parts
ISO-8601 Duration Converter
Parse and convert ISO-8601 duration strings like P1Y2M3DT4H
ISO-8601 Date-Time Parser
Break down an ISO-8601 string into its component fields
kebab-case Converter
Convert text to lowercase-kebab-case for CSS and URLs
KOI8-R Encoder/Decoder
Russian Cyrillic KOI8-R byte encoding to hex and back
Lat/Lng to DMS Converter
Convert decimal latitude/longitude to degrees, minutes and seconds
Lat/Lng to ECEF Converter
Convert WGS-84 lat/long/altitude to ECEF Cartesian XYZ
Lat/Lng to Maidenhead Locator
Convert coordinates to a Maidenhead ham-radio grid square
Lat/Lng to MGRS Converter
Convert coordinates to a Military Grid Reference System string
Lat/Lng to Plus Code Converter
Encode coordinates as an Open Location Code (Plus Code)
Leading Zeros Counter (CLZ)
Count leading zero bits in an integer (CLZ operation)
LEB128 Encoder/Decoder
Encode integers to WASM-style Little Endian Base 128 format
Line Ending Converter (CRLF / LF)
Switch between Windows CRLF, Unix LF, and classic Mac CR
Relative Luminance Calculator
Compute WCAG relative luminance for any RGB or hex color
Mac Absolute Time Converter
Convert Apple CFAbsoluteTime in seconds since 2001-01-01 to dates
Maidenhead Locator to Lat/Lng
Convert Maidenhead grid square references to lat/long coordinates
Mailto URI Encoder
Build a mailto: URI with to/cc/bcc/subject/body encoded
Metaphone Encoder
More accurate phonetic encoding than Soundex for English words
MGRS to Lat/Lng Converter
Convert MGRS grid references back to decimal lat/long
Morse Code Encoder/Decoder
Convert text to and from International Morse Code dots and dashes
NATO Phonetic Alphabet Converter
Spell out any text using the NATO phonetic alphabet
Netstring Encoder/Decoder
Encode strings in Bernstein's length:data, netstring format
Multi-Base Number Display
See any integer simultaneously in binary, octal, decimal, and hex
NYSIIS Encoder
New York State Identification and Intelligence System phonetic code
Octal Text Converter
Convert text to octal byte values — like \033 in shell scripts
Octal to Binary Converter
Translate base-8 octal numbers into binary bit strings
Octal to Decimal Converter
Convert base-8 octal numbers to base-10 decimal
One's Complement Converter
Flip every bit to compute the one's-complement binary of an integer.
Ordinal Date Converter
Convert between calendar dates and ISO ordinal dates (YYYY-DDD)
PascalCase Converter
Convert text to PascalCase — every word capitalised, no separators
URL Percent-Decoder
Decode percent-encoded URL characters back to plain readable text
URL Percent-Encoder
Percent-encode special characters in a URL or URI component
Percent / URL Encoding
Encode arbitrary bytes as %XX sequences for URLs
Plus Code to Lat/Lng Converter
Decode a Plus Code back to decimal lat/long coordinates
Google Polyline Decoder
Decode a Google encoded polyline string into lat/long points
Google Polyline Encoder
Encode a list of lat/long points as a Google encoded polyline
Q-Encoding (RFC 2047) Encoder
MIME header word encoding: =?UTF-8?Q?...?= for non-ASCII
RFC-2822 Date Converter
Convert between RFC-2822 email date format and ISO dates
RFC-3339 Date Converter
Convert between RFC-3339 timestamp strings and other formats
ROT-13 Encoder/Decoder
Apply the ROT-13 Caesar cipher substitution to any text
Run-Length Encoding (RLE)
Compress repeated runs: AAABBC → 3A2B1C
SCREAMING_SNAKE_CASE Converter
Convert text to UPPER_SNAKE_CASE for constants and env vars
Sexagesimal (Base-60) Converter
Convert integers to and from base-60 Babylonian sexagesimal notation.
Shift-JIS Encoder/Decoder
Show Shift-JIS (CP932) byte sequences for Japanese text
Sign-Magnitude Converter
Encode signed integers as a sign bit plus a plain magnitude in binary.
Slugify
Convert any string to a URL-safe lowercase-hyphenated slug
snake_case Converter
Convert camel, space, or kebab text to lowercase_snake_case
Soundex Encoder
Encode names to their 4-char Soundex phonetic code
Tab ↔ Space Converter
Expand tabs to spaces or compress spaces to tabs at a chosen width
Tel URI Encoder
Format phone numbers as RFC 3966 tel: URI strings
Balanced Ternary Converter
Convert integers to and from balanced ternary using digits T (−1), 0 and 1.
Inline Text Diff Viewer
Compare two strings character-by-character with inline highlights
Multi-Timezone World Clock
Show the current time in multiple world timezones simultaneously
Timezone Abbreviation Decoder
Look up which timezones use an abbreviation like CST or IST
Timezone Offset Converter
Convert date-times between any two timezone offsets
Trailing Zeros Counter (CTZ)
Count trailing zero bits in an integer (CTZ operation)
Two's Complement Converter
Compute the two's-complement binary of a signed integer at any bit width.
Unicode Code Point Inspector
Show code point, category, block, and UTF-8 bytes per character
Unicode NFC Normaliser
Compose Unicode sequences to NFC canonical form
Unicode NFD Decomposer
Decompose precomposed Unicode characters to NFD base + marks
Unicode NFKC Normaliser
Compatibility + composition normalisation — collapses ligatures, widths
Unicode NFKD Decomposer
Compatibility + decomposition — exposes every combining element
Homoglyph Steganography Encoder
Hide bits by swapping Latin letters for Cyrillic lookalikes
Current Unix Timestamp
See the current Unix timestamp in seconds, ms, µs, and ns
Unix Timestamp (Microseconds) Converter
Convert Unix epoch microseconds to/from human-readable date-time
Unix Timestamp (Milliseconds) Converter
Convert Unix epoch milliseconds to/from human-readable date-time
Unix Timestamp (Nanoseconds) Converter
Convert Unix epoch nanoseconds to/from human-readable date-time
Unix Timestamp (Seconds) Converter
Convert Unix epoch seconds to/from human-readable date-time
UPC-E to UPC-A Expander
Expand a 6-digit UPC-E suppressed barcode to 12-digit UPC-A
UTF-16 to UTF-8 Converter
Transcode text or byte sequences from UTF-16 to UTF-8
UTF-8 Byte Counter
Count the exact number of UTF-8 bytes in any text string
UTF-8 to Unicode Code Points
Explode any UTF-8 text into its Unicode code point values
UUencode Encoder/Decoder
Encode and decode files with classic UNIX uuencode format
UUEncode / UUDecode
Classic Unix-to-Unix email attachment encoding, in your browser
Whitespace Normaliser
Collapse multiple spaces, trim, and fix invisible space characters
Whitespace Steganography Encoder
Hide a secret message in space/tab patterns in blank lines
Windows FILETIME Converter
Convert Windows FILETIME 64-bit values to readable dates
XXEncode / XXDecode
UUEncode variant using only alphanumerics, plus and minus
yEnc Encoder/Decoder
Usenet binary encoding roughly twice as efficient as UUEncode
Z85 Encoder/Decoder
ZeroMQ's printable Base85 variant safe in code strings
Zero-Width Character Steganography
Hide text in zero-width Unicode chars invisible in normal display
ZigZag Integer Encoder
Encode signed integers via protobuf ZigZag encoding
URL Decoder
Decode percent-encoded text and URLs back to readable form.
Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case and more.
Unix Timestamp Converter
Convert Unix epoch timestamps to dates and back — UTC, local, ISO and relative.
IP Subnet / CIDR Calculator
Work out network, broadcast, host range and mask from any IPv4 CIDR.
Binary to Decimal Converter
Turn any binary number into its base-10 value instantly.
Decimal to Binary Converter
Convert any whole number to binary, grouped for readability.
Decimal to Octal Converter
Convert any whole number to octal (base 8) instantly.
Roman Numeral Converter
Convert numbers to Roman numerals and back, both directions.
User-Agent Parser
Break a browser User-Agent string into browser, engine, OS and device.
MAC Address Lookup
Decode a MAC address — vendor OUI, unicast/multicast and local/universal.
DNS Record Explainer
Understand DNS record types and parse any zone-file line.
Glob Pattern Tester
Test glob patterns against a list of paths in real time.
Timestamp to Relative Time Converter
Turn a Unix timestamp into "3 hours ago" or "in 2 days".
Milliseconds to Time Converter
Break milliseconds into days, hours, minutes, seconds.
Epoch Milliseconds Converter
Convert between epoch milliseconds and human dates.
Time Ago Calculator
How long ago was a date — in plain language.
HAR File Viewer
Inspect a .har network capture without uploading it.
PX to EM Converter
Convert pixels to em relative to a parent font size.
Golden Ratio Calculator
Split any length into golden-ratio segments using φ ≈ 1.618.
Open Graph Tag Preview
Preview your Open Graph link card and generate the meta tags.
IP to Binary Converter
Convert an IPv4 address to binary, hex and decimal.
CIDR to IP Range
Expand a CIDR block to its network, broadcast and host range.
Subnet Mask Converter
Convert between CIDR prefix and dotted-decimal subnet mask.
IPv6 Expander
Expand a compressed IPv6 address to its full 8-group form.
IP Class Finder
Find the class (A–E) and scope of any IPv4 address.
Rotate PDF Pages
Turn sideways or upside-down PDF pages the right way up, then export.
Base-N Number Converter
Convert a number between any bases from 2 to 36.
Two's Complement Calculator
Signed decimal to two's complement binary and hex.
Binary Arithmetic Calculator
Add, subtract, multiply, divide and bitwise on binary numbers.
PDF Watermark
Stamp a text or image watermark onto every page of a PDF — opacity, position and rotation, all in your browser.
Cron Expression Builder
Build, decode and preview cron schedules visually — see the next runs instantly.
Gantt Chart Maker
Plan a project timeline with tasks, dependencies and a critical path — then export a PNG.
Pivot Table Builder
Turn raw CSV into a summarised pivot table — drag fields, aggregate, export.
URL Parser
Break a URL into protocol, host, port, path, query and hash.
Slug From Title
Turn a headline into a short, clean URL slug.
Markdown to Jira
Convert Markdown into Jira wiki markup for tickets and comments.
Jira to Markdown
Convert Jira wiki markup back into clean Markdown.
PDF Text Extractor
Pull all the text out of a PDF and copy or download it as a .txt file.
Crontab Expression Builder
Build and read cron schedules field by field.
Kebab Case to Camel Case Converter
Turn 'kebab-case' identifiers into 'camelCase' instantly.
Snake Case to Camel Case Converter
Turn 'snake_case' identifiers into 'camelCase' instantly.
Camel Case to Snake Case Converter
Turn 'camelCase' identifiers into 'snake_case' instantly.
Constant Case Converter
Turn any text into 'CONSTANT_CASE' for env vars and constants.
Dot Case Converter
Turn any text into 'dot.case' for keys and namespaces.
Add Page Numbers to a PDF
Stamp Bates-style page numbers onto any PDF — position, format and font your way.
Chart Maker
Paste a table, pick bar, line or pie, then export a high-resolution PNG.
HTML Live Editor
Write HTML, CSS and JS and see the result render live.
cURL to Code Converter
Paste a curl command, get ready-to-run fetch, axios, Python or PHP code.
PDF Metadata Editor
View and edit a PDF's title, author, subject and keywords, then export.
Link-in-Bio Page Builder
Build a personal link-in-bio page and export it as one standalone HTML file.
PDF Form Filler
Load a fillable PDF, type into its fields, then flatten and download.
Data Anonymizer
Mask emails, names, phones and cards in CSV or JSON with realistic fakes.
Sign PDF Online
Draw or type a signature, place it on any page, and download a signed PDF.
Conventional Commit Builder
Build a spec-compliant Conventional Commits message and copy it in one click.
PDF N-up: Multiple Pages Per Sheet
Arrange 2, 4, 6, 8, 9 or 16 PDF pages on one sheet for printing.
PDF Cropper
Trim page margins and set a new crop box on every page — preview and download.
Delete Pages from a PDF
Remove unwanted pages from a PDF and download the trimmed file.
ZIP Archive Explorer
Open a .zip in your browser, browse its files, preview text and images, and extract any file.
PDF Booklet Imposition Tool
Reorder PDF pages into 2-up saddle-stitch booklet print order.
Crontab to Human
Paste a cron expression and get a plain-English schedule plus the next run times.
PDF Text Per Page
Extract the text from each PDF page into a labelled, copyable list.
Batch Timestamp Converter
Convert a whole list of Unix timestamps and dates at once — timezone-aware, copy and export.
Number Base Converter
Convert between binary, octal, decimal, hex and any base from 2 to 36.
Markdown to PDF Converter
Write Markdown, preview live, export a styled PDF — all in your browser.
XPath Tester & Evaluator
Run XPath 1.0 expressions against your XML and see every matching node — live, in your browser.
Chmod Calculator
Tick read, write and execute boxes — get the octal chmod command.
Subnet Calculator
IPv4 address + CIDR or mask → network, broadcast, host range and counts.
REM to PX Converter
Convert rem to pixels instantly — single values, batch lists, and full spacing-scale previews.
Line Height Calculator
Convert line-height across all CSS units, see leading, and check readability.
PX to REM Converter
Convert pixel values to rem — single, bulk, reference table, and reverse lookup.
Frequently asked questions
Is it safe to paste sensitive data like JWTs or API responses?
Yes. Every developer tool processes data entirely in your browser — nothing is uploaded, stored or logged — so pasting a token, secret or production payload is as safe as running the code locally.
Do the tools work offline?
Once a tool page has loaded it runs without a network connection, because the processing happens in your browser rather than on a server.
Are there usage or size limits?
There are no artificial rate limits or account gates. The only practical limit is your device's memory, since large inputs are processed in-browser.
Which formats and encodings are supported?
JSON, YAML, TOML, XML, CSV/TSV and SQL formatting; Base64, Base32, Base58 and URL/HTML encoding; MD5, SHA and HMAC hashing; plus JWT, UUID/ULID and many more.